CN105368409B - A kind of oil base drilling fluid compound sealing agent and preparation method thereof - Google Patents
A kind of oil base drilling fluid compound sealing agent and preparation method thereof Download PDFInfo
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- CN105368409B CN105368409B CN201510827122.2A CN201510827122A CN105368409B CN 105368409 B CN105368409 B CN 105368409B CN 201510827122 A CN201510827122 A CN 201510827122A CN 105368409 B CN105368409 B CN 105368409B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
Abstract
The present invention provides a kind of compound sealing agent of oil base drilling fluid, raw material of the oil base drilling fluid with compound leakage stop agent by weight percentage：20%~50% plugging material, 0.5%~2% fibrous material, 5%~20% oil swell material, 20%~40% lipophile ultra-fine grain material, 10%~20% lipophile flaky material.The sealing agent bores the leak-proof leak-stopping demand for meeting permeable formation and fractured leakage stratum mainly for oil base drilling fluid system, and for the cracks 5mm, compression strength can reach 7MPa；Depth of invasion reduced rate in casting bed evaluation test>90%.It is remarkably improved oil base drilling fluid leak stopping success rate, enhances Formation bearing pressure.
Description
Technical field
The present invention relates to the additive for drilling fluid field used in drilling process, more particularly to a kind of oil base drilling fluid is used
Compound sealing agent and preparation method thereof.
Background technology
Compared with traditional water-base drilling fluid, oil base drilling fluid is with caving control performance is strong, greasy property is excellent, rheological characteristic
Can good, temperature resistance, strong antifouling property many advantages, such as, therefore oil base drilling fluid has been widely used in domestic fine and close oil, fine and close
In the wellbore construction of the unconventional petroleum resources such as gas and shale oil, air water horizontal well exploitation.However in oil base drilling fluid drilling well
When leakage occurring in journey, drillng operation safety is seriously endangered, especially oil base drilling fluid is of high cost, can cause greatly economic damage
It loses.And common water-base drilling fluid sealing agent is generally hydrophily water uptake expansion material, can not be sent out in oil base drilling fluid system
The leak-proof leak-stopping effect waved, while the distinctive greasy property of oil base drilling fluid and rheological property easily cause plugging material and build bridge and be stranded
Be difficult to and pit shaft in pressure oscillation it is larger, plugged zone is easily reversed and washes open, therefore the common plugging material that blocks is in oil base drilling well
It can not play a role in leak-proof leak-stopping in liquid.
The achievement obtained in the special sealing agent research and development of oil base drilling fluid and application aspect domestic at present is less.Patent application
201410602335.0 disclose " a kind of compound leak preventive of oil base drilling fluid " with spherical gel, the rigid material of 5um~18um
Four kinds of material, the flexible fiber of 45~380um and flexible particle components are combined into, which leaks different permeability
Lost territory layer has good adaptability, but the rigid material calcium carbonate superfine powder in the compound leak preventive is water wetted material, in oil
Dispersion effect of easily reuniting in base drilling fluid is poor, and the asbestos wool in flexible fiber is not environmentally material.Patent application
201410428352.7 disclose " a kind of oil base drilling fluid fracture plugging agent " by oil swell material, deformed shaped particles, fibrous material,
Plugging material, calcium carbonate superfine powder and surfactant composition, the oil base drilling fluid sealing agent are suitable for hypertonic and fractured leakage
The leak-proof leak-stopping demand on stratum, for crack≤4mm, compression strength can reach 7MPa or more, but the oil base drilling fluid leak stopping
Agent is not added with easily dispersion lipophile sheet plugging material and ultra-fine grain material, for the fracture plugging pressure-bearing effect more than 4mm
It is bad, while the oil base drilling fluid sealing agent equally exists the hydrophilic and oleophobic scattering problem of calcium carbonate superfine powder.From domestic literature tune
It grinds result and finds out that oil base drilling fluid circulation problems are not solved yet, oil base drilling fluid leak-proof leak-stopping technology is still domestic
Petroleum works field is very paid close attention to and the technical barrier of urgent need to resolve.
Invention content
In order to overcome the problems, such as that prior art leak stopping is low success rate of, the present invention provides a kind of oil base drilling fluids with compound
Sealing agent and preparation method thereof, the compound sealing agent principle are to utilize inertia three-dimensional plugging material, lipophile two-dimensional sheet material
Material, one dimension fibre material build bridge to form leak stopping layer, while time lagged swelling type oil swell material, lipophile ultra-fine grain material enter
Leak stopping layer blocks, limitation is permeated, and each component synergistic effect, which achievees the effect that block, controls leakage, which is remarkably improved
Oil base drilling fluid leak stopping success rate.
The technical solution adopted by the present invention is：
A kind of compound sealing agent of oil base drilling fluid：Raw material by weight percentage：
Plugging material 20%~50%；
Fibrous material 0.5%~2%；
Oil swell material 5%~20%；
Lipophile ultra-fine grain material 20%~40%；
Lipophile flaky material 10%~20%.
The plugging material is the one or more in agstone, walnut shell, almond shell.
The fibrous material is thunder spy fiber, polyacrylonitrile fibre, polyurethane elastomeric fiber, poly terephthalic acid fourth two
One or more in alcohol ester fiber.
The oil swell material is butyl acrylate, methyl methacrylate, butyl methacrylate, methacrylic acid
Two or more in octadecyl ester, hydroxyethyl methacrylate, styrene, rubber powder is polymerized by emulsion method.
The ultra-fine rigid particles material of the lipophile is talcum powder.
The lipophile flaky material be common crystalline flake graphite, elastic graphite, one kind in expanded graphite or it is a kind of with
On.
Agstone is used using the mesh different-grain diameter collocation of 10 mesh~325 in the plugging material；Plugging material center
Peach shell or Pericarppium Armeniacae Amarum are used using the mesh different-grain diameter collocation of 10 mesh~40.
The grain size of the talcum powder is the mesh of 1000 mesh~3000.
The lipophile ultra-fine grain material talcum powder grain size collocation is more than 1000 mesh and less than 1000 with ratio
The talcum powder 1 of mesh grain size:2~3:1.
A kind of oil base drilling fluid preparation method of compound sealing agent, sequentially adds weight percent in mixing apparatus
Raw material, plugging material 20%~50%, oil swell material 5%~20%, lipophile ultra-fine grain material 20%~
40%, fibrous material 0.5%~2%, uniformly mixing obtain the oil base drilling fluid with compound sealing agent.
Beneficial effects of the present invention：
（1）Plugging material lipophile good dispersion.Hydrophily plugging material compounding, the present invention are mostly used in previous sealing agent
The compound sealing agent core material of oil base drilling fluid：Two-dimensional sheet material elastic graphite, ultra-fine grain material talcum powder and prolong
When intumescent oil swell material be all lipophile material, can dispersion avoids reuniting well in oil base drilling fluid, play leakproof
Plugging effect.
（2）Plugging material size and grain size collocation are reasonable.Previous sealing agent is not added with fiber-like material, sheet material mostly
The one or more of material, ultra-fine grain or time lagged swelling type oil swell material, there are leak-proof leak-stopping bad adaptability, bearing capacities
The problem of easily being leaked again after low and leak stopping.The oil base drilling fluid of the present invention optimizes the ruler of recipe ingredient with compound sealing agent
Very little and grain size keeps its collocation more rational, and it is good that leakage effect is controlled in each component synergistic effect closure.
（3）Oil base drilling fluid is extensive with compound sealing agent adaptability, can be used for general mineral oil（Such as white oil, diesel oil）With
Using makings oil as the various oil base drilling fluids of the synthesis base oil configuration of representative.Primary raw material source is wide, cheap, execute-in-place
Use simplicity.
The oil base drilling fluid prepared using this method is remarkably improved oil base drilling fluid leak stopping success with compound sealing agent
Rate enhances Formation bearing pressure.For the cracks 5mm, compression strength can reach 7MPa when sealing agent dosage 7%；Casting bed evaluation test
It can make mud filtrate invasion depth reduced rate when middle sealing agent dosage 5%>90%.There is plugging permeable compared with domestic similar products
It is more preferable to miss effect, blocks slit formation and misses the higher technical characterstic of compression strength.The compound sealing agent of the oil base drilling fluid
The application in the shale gas Horizontal Well Project in Sichuan-chongqing Region " Changning-Weiyuan national level shale gas demonstration area " achieves well
Effect.
The present invention controls leakage technical barrier for the closure of solution oil base drilling fluid and provides a kind of new method, solves sealing agent
Compatibility is poor in oil base drilling fluid, ultra-fine grain component is hydrophilic and oleophobic is not easy to disperse, blocks the problems such as anti-pressure ability is poor.This is stifled
The rheological characteristic for leaking the oil base drilling fluid leak stopping slurry that agent is prepared is good, and electrical stability is stablized, and closure anti-pressure ability is significantly higher than domestic same
Class product, and sealing agent raw material sources are wide, cheap, preparation method and required appointed condition are simple, easy to implement, Neng Gouman
Leak-proof leak-stopping technology requirement during sufficient oil base drilling fluid drilling construction, significantly reduces oil base drilling fluid use cost, obtains good
Good economic benefit and social benefit, is worthy of popularization.
Specific implementation mode
Embodiment 1：
In order to overcome the problems, such as that prior art leak stopping is low success rate of, the present invention provides a kind of oil base drilling fluids with compound
Sealing agent and preparation method thereof, the compound sealing agent principle are to utilize inertia three-dimensional plugging material, lipophile two-dimensional sheet material
Material, one dimension fibre material build bridge to form leak stopping layer, while time lagged swelling type oil swell material, lipophile ultra-fine grain material enter
Leak stopping layer blocks, limitation is permeated, and each component synergistic effect, which achievees the effect that block, controls leakage, which is remarkably improved
Oil base drilling fluid leak stopping success rate.
A kind of compound sealing agent of oil base drilling fluid：Raw material by weight percentage：
Plugging material 20%；
Fibrous material 0.5%；
Oil swell material 20%；
Lipophile ultra-fine grain material 40%；
Lipophile flaky material 19.5%.
Plugging material lipophile good dispersion.Hydrophily plugging material compounding is mostly used in previous sealing agent, it is of the invention
The compound sealing agent core material of oil base drilling fluid：Two-dimensional sheet material elastic graphite, ultra-fine grain material talcum powder and delay
Intumescent oil swell material is all lipophile material, can well disperse to avoid reuniting in oil base drilling fluid, it is stifled to play leakproof
Leak effect.
Plugging material size and grain size collocation are reasonable.Previous sealing agent is not added with fiber-like material, flaky material, surpasses mostly
The one or more of fine grained or time lagged swelling type oil swell material, there are leak-proof leak-stopping bad adaptabilities, and bearing capacity is low, with
And the problem of easily being leaked again after leak stopping.The oil base drilling fluid of the present invention optimizes the size and grain of recipe ingredient with compound sealing agent
Diameter keeps its collocation more rational, and it is good that leakage effect is controlled in each component synergistic effect closure.
Embodiment 2：
A kind of compound sealing agent of oil base drilling fluid：Raw material by weight percentage：
Plugging material 35%；
Fibrous material 1%；
Oil swell material 19%；
Lipophile ultra-fine grain material 30%；
Lipophile flaky material 15%.
Plugging material lipophile good dispersion.Hydrophily plugging material compounding is mostly used in previous sealing agent, it is of the invention
The compound sealing agent core material of oil base drilling fluid：Two-dimensional sheet material elastic graphite, ultra-fine grain material talcum powder and delay
Intumescent oil swell material is all lipophile material, can well disperse to avoid reuniting in oil base drilling fluid, it is stifled to play leakproof
Leak effect.
In the present embodiment, selection plugging material is agstone, in plugging material agstone using the mesh of 10 mesh~325 not
It arranges in pairs or groups and uses with grain size；Fibrous material is thunder spy's fiber, and oil swell material is that butyl acrylate and methyl methacrylate pass through
Emulsion method is polymerized, and the ultra-fine rigid particles material of lipophile is talcum powder, and the grain size of talcum powder is the mesh of 1000 mesh~3000, sliding
The collocation of mountain flour grain size is with the talcum powder 1 that ratio is more than 1000 mesh and less than 1000 mesh grain sizes:2~3:1.；Lipophile piece
Shape material is elastic graphite.
Plugging material can also be that plugging material is one or more in walnut shell, almond shell.In plugging material
Walnut shell or Pericarppium Armeniacae Amarum are used using the mesh different-grain diameter collocation of 10 mesh~40.
Fibrous material can also be polyacrylonitrile fibre, polyurethane elastomeric fiber, polybutylene terephthalate (PBT) fiber
In one or more.
Oil swell material is butyl acrylate, methyl methacrylate, butyl methacrylate, methacrylic acid 18
Two or more in ester, hydroxyethyl methacrylate, styrene, rubber powder is polymerized by emulsion method.
Lipophile flaky material can also be the one or more in common crystalline flake graphite, expanded graphite.
Plugging material size and grain size collocation are reasonable.Previous sealing agent is not added with fiber-like material, flaky material, surpasses mostly
The one or more of fine grained or time lagged swelling type oil swell material, there are leak-proof leak-stopping bad adaptabilities, and bearing capacity is low, with
And the problem of easily being leaked again after leak stopping.The oil base drilling fluid of the present invention optimizes the size and grain of recipe ingredient with compound sealing agent
Diameter keeps its collocation more rational, and it is good that leakage effect is controlled in each component synergistic effect closure.
Embodiment 3：
In the present embodiment, a kind of compound sealing agent of oil base drilling fluid：Raw material by weight percentage：
Plugging material 50%；
Fibrous material 2%；
Oil swell material 18%；
Lipophile ultra-fine grain material 20%；
Lipophile flaky material 10%.
Plugging material lipophile good dispersion.Hydrophily plugging material compounding is mostly used in previous sealing agent, it is of the invention
The compound sealing agent core material of oil base drilling fluid：Two-dimensional sheet material elastic graphite, ultra-fine grain material talcum powder and delay
Intumescent oil swell material is all lipophile material, can well disperse to avoid reuniting in oil base drilling fluid, it is stifled to play leakproof
Leak effect.
In the present embodiment, selection plugging material is agstone, in plugging material agstone using the mesh of 10 mesh~325 not
It arranges in pairs or groups and uses with grain size；Fibrous material is thunder spy's fiber, and oil swell material is that butyl acrylate and methyl methacrylate pass through
Emulsion method is polymerized, and the ultra-fine rigid particles material of lipophile is talcum powder, and the grain size of talcum powder is the mesh of 1000 mesh~3000, sliding
The collocation of mountain flour grain size is with the talcum powder 1 that ratio is more than 1000 mesh and less than 1000 mesh grain sizes:2~3:1.；Lipophile piece
Shape material is elastic graphite.
Plugging material can also be that plugging material is one or more in walnut shell, almond shell.In plugging material
Walnut shell or Pericarppium Armeniacae Amarum are used using the mesh different-grain diameter collocation of 10 mesh~40.
Fibrous material can also be polyacrylonitrile fibre, polyurethane elastomeric fiber, polybutylene terephthalate (PBT) fiber
In one or more.
Oil swell material is butyl acrylate, methyl methacrylate, butyl methacrylate, methacrylic acid 18
Two or more in ester, hydroxyethyl methacrylate, styrene, rubber powder is polymerized by emulsion method.
Lipophile flaky material can also be the one or more in common crystalline flake graphite, expanded graphite.
Plugging material size and grain size collocation are reasonable.Previous sealing agent is not added with fiber-like material, flaky material, surpasses mostly
The one or more of fine grained or time lagged swelling type oil swell material, there are leak-proof leak-stopping bad adaptabilities, and bearing capacity is low, with
And the problem of easily being leaked again after leak stopping.The oil base drilling fluid of the present invention optimizes the size and grain of recipe ingredient with compound sealing agent
Diameter keeps its collocation more rational, and it is good that leakage effect is controlled in each component synergistic effect closure.
Embodiment 4：
In the present embodiment, a kind of preparation method of the compound sealing agent of oil base drilling fluid is chosen 325 in the present embodiment
30 parts of mesh agstone, 10 parts of oil swell material, 10 parts of 1000 mesh talcum powder, 30 parts of 3000 mesh talcum powder, elastic graphite powder 20
Part, it is placed in mixing apparatus and uniformly mix up to the compound sealing agent of the oil base drilling fluid.Oil swell used in it
Material is that oil suction monomer is polymerized by emulsion method by methyl methacrylate, butyl methacrylate and styrene.
Embodiment 5：
It is in the present embodiment, 10 parts of 100 mesh lime stone, 10 parts of 325 mesh agstone, 20 parts of 40 mesh walnut shell, thunder is special fine
1 part of dimension, 19 parts of oil swell material, 15 parts of 1000 mesh talcum powder, 15 parts of 3000 mesh talcum powder, 10 parts of elastic graphite powder, are placed on mixed
It closes and carries out uniformly mixing up to the compound sealing agent of the oil base drilling fluid in equipment.Oil swell material is by methyl used in it
Methyl acrylate, butyl methacrylate and styrene are that oil suction monomer is polymerized by emulsion method.
Embodiment 6：
In the present embodiment, by 10 parts of 100 mesh lime stone, 20 parts of 40 mesh walnut shell, 10 parts of 10 mesh walnut shell, thunder spy's fiber
0.5 part, 0.5 part of polybutylene terephthalate (PBT) fiber, 19 parts of oil swell material, 20 parts of 1000 mesh talcum powder, 3000 mesh slide
10 parts of mountain flour, 10 parts of elastic graphite powder are placed in mixing apparatus uniformly mix and be blocked up with compound up to the oil base drilling fluid
Leak agent.Oil swell material used in it is that oil suction monomer passes through antiphase emulsifiable method by butyl acrylate, butyl methacrylate
It is polymerized.
Embodiment 7：
In the present embodiment, by 10 parts of 10 mesh agstone, 10 parts of 100 mesh lime stone, 10 parts of 40 mesh walnut shell, 10 mesh walnuts
20 parts of shell, 0.5 part of thunder spy fiber, 0.5 part of polybutylene terephthalate (PBT) fiber, 19 parts of oil swell material, 1000 mesh talcums
15 parts of powder, 5 parts of 3000 mesh talcum powder, 10 parts of elastic graphite powder are placed in mixing apparatus uniformly mix and be bored up to the oil base
The compound sealing agent of well liquid.Oil swell material used in it is oil suction monomer by butyl acrylate, butyl methacrylate
It is polymerized by antiphase emulsifiable method.
Above-described embodiment product is tested for the property.
Test 1：The oil base drilling fluid of embodiment 4~7 is evaluated with the compatibility of compound sealing agent and oil base drilling fluid.
Oil base drilling fluid formula is as follows：White oil and 25%CaCl2The mass percent ratio 80 of brine：20, the total weight of white oil and brine
+ 3.0%+2.0% wetting agent of organoclay of+2.0% fluid loss additive of+2.0% calcium hydroxide of 3.0% emulsifier+weighting material of meter, drilling well
Liquid-tight degree 1.30g/cm3.After the rolling of drilling fluid 150 DEG C × 16h heat, the compound sealing agent 5% of the embodiment of the present invention 4~7 is had rated
Property of drilling fluid under the conditions of dosage.Measure base slurry and experiment slurry（65±1）DEG C property of drilling fluid, the results are shown in Table 1.
The compatibility of table 1 compound sealing agent and oil base drilling fluid
| Formula | PV/mPa.s | YP/Pa | FLHTHP /ml | ES/v |
| Base is starched | 24 | 7.0 | 12.0 | 1082 |
| Base slurry+embodiment 4 | 29 | 9.0 | 4.2 | 941 |
| Base slurry+embodiment 5 | 31 | 13.0 | 5.0 | 976 |
| Base slurry+embodiment 6 | 39 | 13.0 | 4.6 | 1012 |
| Base slurry+embodiment 7 | 43 | 12.5 | 6.2 | 943 |
By table 1 it is found that the product is added in oil base drilling fluid, the rheological property and electrical stability of oil base drilling fluid do not have
Big variation occurs, but high temperature and high pressure filter loss is substantially reduced, shows that the compound sealing agent of the oil base drilling fluid is bored with oil base
Well liquid has good compatibility performance.
Test 2：The oil base drilling fluid of embodiment 4 evaluates its seal-off effect with compound sealing agent by casting bed evaluation test
Energy.Experimental condition：Oil base drilling fluid（Formula is the same as test 1）Density 1.30g/cm3；Sand size：The mesh of 20 mesh~40；Experiment pressure
Power：0.69MPa；Testing time：10min.Evaluation result see the table below 2.
2 compound sealing agent casting bed evaluation test of table
| Formula | Depth of invasion（cm,0.69MPa/10min） | Depth of invasion reduced rate（%） |
| Base is starched | 5.6 | - |
| Base starches+1% product | 3.2 | 42.86% |
| Base starches+3% product | 1.4 | 75.00% |
| Base starches+5% product | 0.5 | 91.07% |
By upper table 2 it can be seen that under the conditions of 5% dosage, compound sealing agent can make the reduction of oil base drilling fluid depth of invasion
Rate reaches 90% or more.Casting bed evaluation test shows that compound sealing agent sealing characteristics is excellent.
Test 3：The oil base drilling fluid of embodiment 5~7 evaluates its seal-off effect with compound sealing agent by QD type leak stopping instruments
Energy.Experimental condition：Oil base drilling fluid（Formula is the same as test 1）Density 1.30g/cm3；Test pressure：0~7.0MPa；Testing time：
30min.Evaluation result see the table below 3.
3 compound sealing agent sealing characteristics evaluation test of table
It can be seen that by 3 data of table, 1~5mm simulation fractures in the oil base plugging drilling fluid room that compound sealing agent configures
Bearing capacity is good, can reach 7.0MPa.1~3mm simulation fracture pressure-bearings test total wastage control within 20ml, 5mm moulds
Quasi- crack pressure-bearing tests total wastage control within 100ml.
Field application：
After product desk research success of the present invention, carried out in the oil base drilling fluid drilling process of the wells such as prestige 204H4-3 wells
Field application.Prestige 204H4-3 wells are the shale gas horizontal wells positioned at Weiyuan, sichuan town, and horizontal segment layer position is Longma small stream group, micro-
Crack and stratification development.Live oil base drilling fluid density 2.35g/cm3, occur when being drilled into 3400m<2.0m3/ h is leaked, in well slurry
The compound sealing agent of the invention of addition 1.0%, continues to creep into, and leakage disappearance underground restores normal, shows good block and prevents
Leak effect.
Claims (2)
1. a kind of compound sealing agent of oil base drilling fluid, it is characterised in that：Raw material by weight percentage：
Plugging material 20%~50%；
Fibrous material 0.5%~2%；
Oil swell material 5%~20%；
Lipophile ultra-fine grain material 20%~40%；
Lipophile flaky material 10%~20%；
The plugging material is the one or more in agstone, walnut shell, almond shell；
The fibrous material is thunder spy fiber, polyacrylonitrile fibre, polyurethane elastomeric fiber, polybutylene terephthalate (PBT)
One or more in fiber；The oil swell material is butyl acrylate, methyl methacrylate, methacrylic acid
Two or more in butyl ester, octadecyl methacrylate, hydroxyethyl methacrylate, styrene, rubber powder passes through breast
Liquid method is polymerized；The ultra-fine rigid particles material of the lipophile is talcum powder；The lipophile flaky material is common
One or more in crystalline flake graphite, elastic graphite, expanded graphite；Agstone uses 10 mesh in the plugging material
The collocation of~325 mesh different-grain diameters uses；Walnut shell or Pericarppium Armeniacae Amarum are made using the mesh different-grain diameter collocation of 10 mesh~40 in plugging material
With；The grain size of the talcum powder is the mesh of 1000 mesh~3000.
2. a kind of compound sealing agent of oil base drilling fluid according to claim 1 provides a kind of oil base drilling fluid with compound
The preparation method of type sealing agent, it is characterised in that：The raw material of weight percent, plugging material are sequentially added in mixing apparatus
20%~50%, oil swell material 5%~20%, lipophile ultra-fine grain material 20%~40%, lipophile flaky material
10%~20%, fibrous material 0.5%~2%, uniformly mixing obtain the oil base drilling fluid with compound sealing agent.
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Effective date of registration: 20201029 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: 710016 Shaanxi city of Xi'an province Weiyang District four road Fengcheng Changqing Technology Building Patentee before: CNPC CHUANQING DRILLING ENGINEERING COMPANY LIMITED ENGINEERING TECHNOLOGY Research Institute |